Be sure to find a clear spot of ground with no metal targets. Put the detector in the All-Metal mode and hold the searchcoil about 4 to 6" above this spot. begin pumping the coil up and down continuously but don't let the coil touch the ground. If the detector threshold audio increases when going toward the ground then adjust the GB control knob more toward the + side. If the detector threshold audio increases when coming up from the ground then adjust the GB control more toward the - side. What you need to accomplish is no change in the threshold audio going up or down. With practice you will be a pro in no time at all. Give it a try and practice this on a regular basis. It is a very important setting but don't be afraid of it. So good hunting and be safe!
John Tomlinson,CET
John's Detectors
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